To provide mixed powders in which soft magnetic powders and binder resins are mixed uniformly, have electrical resistances where an overcurrent can be restricted between soft magnetic powder particles, and are a raw material of dust core having high mechanical intensity at normal temperatures and high temperatures, with the dust core obtained from the mixed powders, and to provide its manufacturing method.
High-intensity dust core powders contain soft magnetic powders; phenolic resin fine powders, preferably phenolic resin fine powders in which the mean particle size is 30 μm or less, which has a methylol group in molecules, and in which a nondissolved part in the case of being dissolved in high excessive boiled methanol is at least 4 mass%, based on the total amount of phenolic resin; a high-intensity dust core is obtained from the dust core powders; and its manufacturing method is provided.
YURI TSUKASA
FUJISAWA KAZUHISA
SEKI YOSHIKAZU
MURAKAMI MASAHIRO
HOJO TAKAFUMI
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